[PATCH] lockdep: undo mm/slab.c annotation

undo existing mm/slab.c lock-validator annotations, in preparation
of a new, less intrusive annotation patch.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 10 insertions, 23 deletions

diff --git a/mm/slab.c b/mm/slab.c
index 85c2e03098a7..fd1e4c4c1397 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1021,8 +1021,7 @@ static void drain_alien_cache(struct kmem_cache *cachep,
         }
 }
 
-static inline int cache_free_alien(struct kmem_cache *cachep, void *objp,
-                                   int nesting)
+static inline int cache_free_alien(struct kmem_cache *cachep, void *objp)
 {
         struct slab *slabp = virt_to_slab(objp);
         int nodeid = slabp->nodeid;
@@ -1040,7 +1039,7 @@ static inline int cache_free_alien(struct kmem_cache *cachep, void *objp,
         STATS_INC_NODEFREES(cachep);
         if (l3->alien && l3->alien[nodeid]) {
                 alien = l3->alien[nodeid];
-                spin_lock_nested(&alien->lock, nesting);
+                spin_lock(&alien->lock);
                 if (unlikely(alien->avail == alien->limit)) {
                         STATS_INC_ACOVERFLOW(cachep);
                         __drain_alien_cache(cachep, alien, nodeid);
@@ -1069,8 +1068,7 @@ static inline void free_alien_cache(struct array_cache **ac_ptr)
 {
 }
 
-static inline int cache_free_alien(struct kmem_cache *cachep, void *objp,
-                                   int nesting)
+static inline int cache_free_alien(struct kmem_cache *cachep, void *objp)
 {
         return 0;
 }
@@ -1760,8 +1758,6 @@ static void slab_destroy_objs(struct kmem_cache *cachep, struct slab *slabp)
 }
 #endif
 
-static void __cache_free(struct kmem_cache *cachep, void *objp, int nesting);
-
 /**
  * slab_destroy - destroy and release all objects in a slab
  * @cachep: cache pointer being destroyed
@@ -1785,17 +1781,8 @@ static void slab_destroy(struct kmem_cache *cachep, struct slab *slabp)
                 call_rcu(&slab_rcu->head, kmem_rcu_free);
         } else {
                 kmem_freepages(cachep, addr);
-                if (OFF_SLAB(cachep)) {
-                        unsigned long flags;
-
-                        /*
-                         * lockdep: we may nest inside an already held
-                         * ac->lock, so pass in a nesting flag:
-                         */
-                        local_irq_save(flags);
-                        __cache_free(cachep->slabp_cache, slabp, 1);
-                        local_irq_restore(flags);
-                }
+                if (OFF_SLAB(cachep))
+                        kmem_cache_free(cachep->slabp_cache, slabp);
         }
 }
 
@@ -3135,7 +3122,7 @@ static void cache_flusharray(struct kmem_cache *cachep, struct array_cache *ac)
 #endif
         check_irq_off();
         l3 = cachep->nodelists[node];
-        spin_lock_nested(&l3->list_lock, SINGLE_DEPTH_NESTING);
+        spin_lock(&l3->list_lock);
         if (l3->shared) {
                 struct array_cache *shared_array = l3->shared;
                 int max = shared_array->limit - shared_array->avail;
@@ -3178,14 +3165,14 @@ free_done:
  * Release an obj back to its cache. If the obj has a constructed state, it must
  * be in this state _before_ it is released.  Called with disabled ints.
  */
-static void __cache_free(struct kmem_cache *cachep, void *objp, int nesting)
+static inline void __cache_free(struct kmem_cache *cachep, void *objp)
 {
         struct array_cache *ac = cpu_cache_get(cachep);
 
         check_irq_off();
         objp = cache_free_debugcheck(cachep, objp, __builtin_return_address(0));
 
-        if (cache_free_alien(cachep, objp, nesting))
+        if (cache_free_alien(cachep, objp))
                 return;
 
         if (likely(ac->avail < ac->limit)) {
@@ -3424,7 +3411,7 @@ void kmem_cache_free(struct kmem_cache *cachep, void *objp)
         BUG_ON(virt_to_cache(objp) != cachep);
 
         local_irq_save(flags);
-        __cache_free(cachep, objp, 0);
+        __cache_free(cachep, objp);
         local_irq_restore(flags);
 }
 EXPORT_SYMBOL(kmem_cache_free);
@@ -3449,7 +3436,7 @@ void kfree(const void *objp)
         kfree_debugcheck(objp);
         c = virt_to_cache(objp);
         debug_check_no_locks_freed(objp, obj_size(c));
-        __cache_free(c, (void *)objp, 0);
+        __cache_free(c, (void *)objp);
         local_irq_restore(flags);
 }
 EXPORT_SYMBOL(kfree);